dt-bindings: input: misc: Add DT bindings for QTI haptics driver

QTI haptics driver adds support for configuring the haptics module
in QTI PMICs based on per-effect configuration defined by the user
through device tree. Add DT bindings for it.

This snapshot is taken as of msm-4.14
commit 9bb584ae3a9d ("msm/sde/rotator: Add rev checks for sdmmagpie").

Change-Id: I7bed67bd3727cbf7fea2945d1bd5d775d8ac0414
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>